using calcite to read csv files from hdfs.

[勾王敏浩]

Hello, everyone. 
This is Wangminhao Gou. I have an urgent need now. I want to read CSV files 
from remote HDFS and parse them using calcite. Now that I can use a file stream 
to get this CSV file, and understand how to use calcite to make a relational 
table of the local csv, what should I do next?
Looking forward to your reply.
Best,
Wangminhao Gou